package com.markerhub.shiro;

import cn.hutool.json.JSONUtil;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.markerhub.common.lang.Result;
import com.markerhub.util.JwtUtils;
import io.jsonwebtoken.Claims;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.ExpiredCredentialsException;
import org.apache.shiro.web.filter.authc.AuthenticatingFilter;
import org.apache.shiro.web.util.WebUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author cxz
 * jwt过滤
 * @version 1.0
 */

@Component
public class JwtFilter extends AuthenticatingFilter {

    @Autowired
    JwtUtils jwtUtils;

    @Override
    protected AuthenticationToken createToken(ServletRequest servletRequest, ServletResponse servletResponse) throws Exception {
        // 获取 token
        HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;
        String jwt = httpServletRequest.getHeader("Authorization");
        if (StringUtils.isEmpty(jwt)){
            return null;
        }


        return  new JwtToken(jwt);
    }

    @Override
    protected boolean onAccessDenied(ServletRequest servletRequest, ServletResponse servletResponse) throws Exception {
        HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;
        String jwt = httpServletRequest.getHeader("Authorization");
        if (StringUtils.isEmpty(jwt)){
            return true;
        }else {
            //校验jwt
            Claims claimByToken = jwtUtils.getClaimByToken(jwt);
            //token为空，或者过期
            if (claimByToken == null || jwtUtils.isTokenExpired(claimByToken.getExpiration())){
                throw  new ExpiredCredentialsException("token已失效，请重新登录");

            }

            //执行登录

        }
        return executeLogin(servletRequest,servletResponse);
    }


    /**
     * 对异常的一个处理
     * @param token
     * @param e
     * @param request
     * @param response
     * @return
     */
    @Override
    protected boolean onLoginFailure(AuthenticationToken token, AuthenticationException e, ServletRequest request, ServletResponse response) {
       HttpServletResponse httpServletResponse= (HttpServletResponse) response;


        Throwable throwable= e.getCause()== null?e :e.getCause();
       //错误返回给前端
        Result result = Result.fail(throwable.getMessage());
        String json = JSONUtil.toJsonStr(result);//hotool的工具

        //httpServletRequest.getWriter().p
        try {
            httpServletResponse.getWriter().print(json);
        } catch (IOException ioException) {

        }

        return false;
    }

    @Override
    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest httpServletRequest = WebUtils.toHttp(request);
        HttpServletResponse httpServletResponse = WebUtils.toHttp(response);
        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
        // 跨域时会首先发送一个OPTIONS请求，这里我们给OPTIONS请求直接返回正常状态
        if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
            httpServletResponse.setStatus(org.springframework.http.HttpStatus.OK.value());
            return false;
        }
        return super.preHandle(request, response);
    }

}
